Free Online Calculators
Age, percentage, GPA, CGPA and BMI calculators that show the formula.
Age Calculator
Find exact age in years, months and days, plus your next birthday.Percentage Calculator
Percent of a number, percent change, marks percentage and more.CGPA Calculator
Combine semester GPAs into a credit-weighted CGPA.GPA Calculator
Calculate GPA from course grades and credit hours.BMI Calculator
Work out body mass index for adults in metric or imperial units.
Calculators that show their working
A result is only useful if you can trust it. Each calculator here shows the formula it used, so you can check the answer yourself or copy the working into an assignment.
The Age Calculator gives an exact age in years, months and days and counts down to the next birthday. ThePercentage Calculator covers the everyday cases: a percent of a number, percent change, marks percentage and adding or removing a discount. Students can use the GPA Calculator for a single term and the CGPA Calculator to combine several semesters. The BMI Calculator works in metric or imperial units for adults.
Grading scales and CGPA-to-percentage rules differ between universities, so always check your own institution's official rule before relying on a converted figure. The BMI calculator is for general information about adults and is not medical advice.
Results update as you type, and the numbers you enter stay in your browser. You can copy a result or share a link that reopens the calculator with the same values.